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Code example for MarkerObject

*
* @author Gavin King
*/
public class BatchFetchQueue {
public static final Object MARKER = new MarkerObject( "MARKER" );
/**
* Defines a sequence of {@link EntityKey} elements that are currently
* elegible for batch-fetching.
* <p/>
* Even though this is a map, we only use the keys. A map was chosen in
* order to utilize a {@link LinkedHashMap} to maintain sequencing
* as well as uniqueness.
* <p/>
* TODO : this would be better as a SequencedReferenceSet, but no such beast exists!
*/
private final MapbatchLoadableEntityKeys = new LinkedHashMap(8);
/**